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Positioning structure

A positioning structure and positioning hole technology, applied in optics, instruments, projection devices, etc., can solve the problems of rising processing costs, rising costs, complex shapes, etc., and achieve the effect of low cost and low cost

Inactive Publication Date: 2006-10-04
FUJI PHOTO OPTICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, since the positioning pin is non-axisymmetric and has a complicated shape, it has the disadvantage that it cannot be produced with high precision. At the same time, if it is produced with high precision, the processing cost will increase.
In addition, in inlaying, post-insertion or external inlay molding, positioning pins 100 must be separately prepared, so the cost increases

Method used

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Examples

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Embodiment Construction

[0033] Specific examples of the present invention will be described in detail below.

[0034] rear projection projector 10, such as figure 1 As shown, it includes: a transmissive rear projection screen 11 for projecting images; a projector unit 12 that generates image light from illumination light and emits it; and a back surface that reflects the image light emitted from the projector unit 12 to the rear projection screen 11 Mirror 13.

[0035] The projector unit 12 and the rear mirror 13 are disposed inside the housing 14 , and the rear projection screen 11 is disposed at the opening of the housing 14 . The rear projection screen 11 has a rectangular shape having long sides in the horizontal direction. The rear projection screen 11 is irradiated with image light from the inside, and the projected image is viewed from the front side. The rear mirror 13 is in the shape of a trapezoid with a long upper side and a shorter lower side, and is inclined to the rear projection sc...

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Abstract

A positioning structure having a positioning projection on attaching surface is provided. The attaching surface (21b) is inclined within an acute angle with respect to a direction orthogonal to an opening and closing direction of a mold (36) for forming the surface. The positioning projection (25) formed on the attaching surface (21b) is molded simultaneously by the metallic molding into a truncated right circular conical shape with a tapered trapezoid section that has a tapered surface inclined within an acute angle with respect to a direction perpendicular to the attaching surface on the outer circumference, and has a tapered front end extending in the perpendicular direction. When the angle of inclination of the attaching surface (21b) with respect to the direction orthogonal to the opening and closing direction of the mold is defined as 'alpha', and the angle of inclination of the tapered surface (38) with respect to the direction perpendicular to the attaching surface (21b) is defined as 'beta', beta-alpha>0 is satisfied.

Description

technical field [0001] The present invention relates to a positioning structure for assembling components with high precision. Specifically, it relates to positioning of components requiring high assembling accuracy during assembly, such as optical components or lens barrels assembled in projectors, etc. structure. Background technique [0002] Conventionally, RPTV (Rear Projection Television) in which a projector unit is placed behind a large-screen display screen and projects onto the display screen is known (Patent Document 1). RPTVs are popular because they are cheaper per screen size than plasma and LCD TVs. However, if the projector unit is to be installed on the back side of the screen, there is a disadvantage that a certain thickness is required. [0003] For this reason, another RPTV has been proposed, that is, by turning the projection lens provided in the projector unit in a slightly V-shape, the increase in the thickness direction dimension caused by the length...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/00
Inventor 土屋一幸大垣幸治稻本雅之
Owner FUJI PHOTO OPTICAL CO LTD